/* Given the reviews table, write a query to get the average stars for each product every month. The output should include the month in numerical value, product id, and average star rating rounded to two decimal places. Sort the output based on month followed by the product id. reviews Table: Column_Name Type review_id integer user_id integer submit_date datetime product_id integer stars integer (1-5) Example Input: review_id user_id submit_date product_id stars 6171 123 06/08/2022 00:00:00 50001 4 7802 265 06/10/2022 00:00:00 69852 4 5293 362 06/18/2022 00:00:00 50001 3 6352 192 07/26/2022 00:00:00 69852 3 4517 981 07/05/2022 00:00:00 69852 2 */ SELECT EXTRACT(MONTH FROM submit_date) as mth, product_id as product, ROUND(AVG(stars),2) as avg_stars FROM reviews GROUP BY EXTRACT(MONTH FROM submit_date), product_id ORDER BY mth, product_id